Cable-stayed bridge steel-concrete connecting structure reliable in force transmission

Abstract

The utility model discloses a cable-stayed bridge steel-concrete connecting structure reliable in force transmission. The cable-stayed bridge steel-concrete connecting structure comprises a steel-concrete combined section body and a built-in anchor pull rod support. The steel-concrete combined section main body comprises an upper tower column outer wall plate, an anchor box, a bearing plate and a shear key; the upper tower column outer wall plate and the anchor box are arranged on the first side face of the bearing plate, and a plurality of through anchor box positioning opposite holes corresponding to the anchor box are formed in the bearing plate. The shear keys are arranged on the second side face of the bearing plate and comprise two shear key steel plates in the bridge direction and two shear key steel plates in the transverse bridge direction. The built-in anchor pull rod support comprises anchor pull rods and anchor beams, and the anchor pull rods penetrate through the anchor box positioning holes and then are fixedly connected with the steel-concrete combined section body. On one hand, the stress and stress structure of the steel-concrete combined section is improved, the more reliable force transmission effect is achieved, and the bearing capacity and the spanning capacity of the steel tower column are improved; and on the other hand, construction such as positioning assembly and pouring mud jacking of the steel-concrete combined section is facilitated, and the construction quality and the construction efficiency of the steel-concrete combined section are guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of hybrid cable-stayed bridges, in particular to a steel-concrete connection structure of a cable-stayed bridge with reliable force transmission. Background Art

[0002] Currently, most cable-stayed bridge towers worldwide use concrete. Before the 21st century, steel towers were hindered by complex construction techniques, high costs, and inconvenient maintenance. With the advancement of steel tower manufacturing technology and economics, steel towers have rapidly developed due to their superior load-bearing capacity, good stability, attractive visual effects, and rapid construction schedules. The steel-concrete joint is a key component of a cable tower, where the steel and concrete columns connect to form a unified structure that supports shared loads and coordinated deformation. Therefore, the structural design of this joint is crucial in a cable tower, not only impacting the mechanical structure of the cable tower and determining its load-bearing capacity and spanning capability. Furthermore, the rational design of this joint also has a certain correlation with the actual construction difficulty, directly affecting the overall progress of bridge construction. Therefore, a steel-concrete joint structure with a scientifically designed, rational structure, stable connection, reliable force transmission, good safety, and easy construction is of great significance to bridge construction. Summary of the Invention

[0003] The present invention aims to solve the above problems and provides a steel-concrete connection structure for a cable-stayed bridge with reliable force transmission. The technical solution of the present invention is as follows:

[0004] A steel-concrete connection structure for a cable-stayed bridge with reliable force transmission, comprising a steel-concrete joint section body and a built-in anchor rod bracket;

[0005] The main body of the steel-concrete combined section includes an upper tower column outer wall plate, an anchor box, a pressure plate and a shear key; the upper tower column outer wall plate and the anchor box are arranged on a first side surface of the pressure plate, and a plurality of the anchor boxes are spaced along the four edges of the pressure plate, and a plurality of anchor box positioning holes are provided on the pressure plate corresponding to the anchor boxes; the shear key is provided on the second side surface of the pressure plate, and includes two oppositely arranged longitudinal shear key steel plates and two oppositely arranged transverse shear key steel plates, and the longitudinal shear key steel plates and the transverse shear key steel plates are evenly arranged with steel through-holes for passing shear key steel bars, and the longitudinal shear key steel plates and the transverse shear key steel plates are connected in sequence to form an inner cavity of the main body of the steel-concrete combined section;

[0006] The built-in anchor rod bracket includes anchor rods and anchor beams. The anchor rods corresponding to the number of anchor boxes are installed on the anchor beams to form the built-in anchor rod bracket. The anchor rods pass through the anchor box positioning holes of the corresponding anchor boxes and are connected and fixed to the steel-concrete combined section body.

[0007] As a further description of the present invention, the longitudinal shear key steel plate and the transverse shear key steel plate are U-shaped steel plates, and the length of the longitudinal shear key steel plate is greater than the length of the transverse shear key steel plate.

[0008] Furthermore, the anchor box includes an outer peripheral anchor box and an inner peripheral anchor box; the outer peripheral anchor box is arranged along the outer periphery of the shear key, and an outer peripheral anchor box positioning hole is arranged on the pressure plate along the outer periphery of the shear key; the inner peripheral anchor box is arranged along the inner periphery of the shear key, and an inner peripheral anchor box positioning hole is arranged on the pressure plate along the inner periphery of the shear key; the anchor rod includes an outer anchor rod corresponding to the outer peripheral anchor box and an inner anchor rod corresponding to the inner peripheral anchor box.

[0009] Furthermore, the built-in anchor rod bracket includes a plurality of seamless steel pipes, and the seamless steel pipes are respectively sleeved on the anchor rods.

[0010] Furthermore, a reserved grouting pipe for grouting is provided on the seamless steel pipe.

[0011] Furthermore, the reserved grouting pipe is a plastic pipe, a connecting pipe is welded to a hole in the seamless steel pipe, and the reserved grouting pipe is installed on the connecting pipe.

[0012] Furthermore, an exhaust hole for grouting exhaust is provided on the top of the anchor box.

[0013] Furthermore, a hand winch is provided at the upper end of the anchor rod for assisting the installation of the anchor rod.

[0014] Furthermore, the positions of the longitudinal shear key steel plate and the transverse shear key steel plate on the pressure plate correspond to the positions of the outer wall plate of the upper tower column.

[0015] Furthermore, a main discharge port for concrete pouring is opened in the middle of the pressure plate.

[0016] Beneficial effects of the utility model:

[0017] The utility model improves the force and stress structure of the steel-concrete combined section through the structural setting of the steel-concrete connection structure of the cable-stayed bridge, realizes a more reliable force transmission effect, and improves the bearing capacity and spanning capacity of the steel tower column; on the other hand, the structural design is more reasonable, while improving the engineering mechanics effect of the steel-concrete combined section, it does not significantly increase the construction difficulty of the steel-concrete combined section. Through the structure of the steel-concrete combined section itself and the setting of related reserved structures, the positioning, assembly, pouring and grouting of the steel-concrete combined section are facilitated, thereby ensuring the construction quality and construction efficiency of the steel-concrete combined section. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1This is a schematic diagram of the position of the steel-concrete connection structure of the cable-stayed bridge with reliable force transmission in the steel cable tower of the utility model;

[0019] Figure 2 The main body of the steel-concrete combined section of the utility model is shown in FIG. Figure 1 ;

[0020] Figure 3 This is a schematic diagram of the assembly of the main body of the steel-concrete combined section and the built-in anchor rod bracket in the embodiment of the present utility model;

[0021] Figure 4 This is a diagram of the shear key stress reinforcement structure of an embodiment of the utility model;

[0022] Figure 5 A schematic diagram of the arrangement of a grouting pipe is provided for an embodiment of the present utility model;

[0023] Figure 6 This is a schematic diagram of the exhaust hole arrangement of the anchor box according to the embodiment of the utility model;

[0024] Figure 7 This is a schematic diagram of the installation of anchor rods according to an embodiment of the present utility model;

[0025] Figure 8 This is a schematic diagram of concrete pouring of the steel-concrete connection structure of a cable-stayed bridge with reliable force transmission according to an embodiment of the utility model.

[0026] Figure numerals: upper tower column outer wall plate 1, anchor box 2, pressure plate 3, anchor box positioning hole 4, longitudinal shear key steel plate 5, transverse shear key steel plate 6, steel through hole 7, anchor rod 8, anchor beam 9, upper steel tower column 10, lower concrete tower column 11, seamless steel pipe 12, connecting pipe 13, plastic pipe 14, exhaust hole 15, hand hoist 16, stress steel bar 17, main discharge port 18, peripheral discharge port 19. DETAILED DESCRIPTION

[0027] Example:

[0028] The following is a detailed description of the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0029] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0030] As attached Figure 1-7As shown, a steel-concrete connection structure of a cable-stayed bridge with reliable force transmission in this embodiment includes a steel-concrete joint section body and a built-in anchor rod bracket; the steel-concrete joint section body includes an upper tower column outer wall plate 1, an anchor box 2, a pressure plate 3 and a shear key; the upper tower column outer wall plate 1 and the anchor box 2 are arranged on the first side of the pressure plate 3, and a plurality of the anchor boxes 2 are spaced apart along the edges of the pressure plate 3, and a plurality of penetrating anchor box positioning holes 4 are provided on the pressure plate 3 corresponding to the anchor boxes 2; the shear key is arranged on the second side of the pressure plate 3, and includes two oppositely arranged shear key steel plates 5 in the bridge direction and two The transverse bridge shear key steel plates 6 are arranged opposite to each other, and the longitudinal bridge shear key steel plates 5 and the transverse bridge shear key steel plates 6 are evenly arranged with steel through-holes 7 for passing shear key steel bars. The longitudinal bridge shear key steel plates 5 and the transverse bridge shear key steel plates 6 are connected in sequence to form the inner cavity of the main body of the steel-concrete joint section; the built-in anchor rod bracket includes anchor rods 8 and anchor beams 9, and the anchor rods 8 corresponding to the number of the anchor boxes 2 are installed on the anchor beams 9 to form the built-in anchor rod bracket, and the anchor rods 8 are respectively passed through the anchor box positioning holes 4 of the corresponding anchor boxes 2 and then connected and fixed to the main body of the steel-concrete joint section.

[0031] See attached Figure 1 As shown, the steel-concrete connection structure of the cable-stayed bridge of this embodiment is the connection part between the upper steel tower column 10 and the lower concrete tower column 11 in the steel cable tower. Specifically, after the anchor rod 8 and the anchor beam 9 of this embodiment are connected and fixed to form an integral built-in anchor rod bracket, the steel-concrete combined section body and the built-in anchor rod bracket are positioned, aligned and assembled in place, and then the stress steel bars 17 are tied and installed on the shear key. Finally, the formwork is built and concrete pouring, secondary grouting and other pouring molding are carried out to form the steel-concrete combined section of the steel cable tower. The upper tower column outer wall plate 1 can be connected to the upper tower column of the steel cable tower, and the lower part is connected to the lower tower column of the steel cable tower, so as to effectively transfer the force on the upper part of the steel cable tower to the lower concrete tower column 11. Through the structural setting of the steel-concrete connection structure of the cable-stayed bridge in this embodiment, on the one hand, the force and stress structure of the steel-concrete joint section are improved, a more reliable force transmission effect is achieved, and the bearing capacity and spanning capacity of the steel tower column are improved; on the other hand, the structural design is more reasonable. While improving the engineering mechanics effect of the steel-concrete joint section, the construction difficulty of the steel-concrete joint section is not greatly increased. Through the structure of the steel-concrete joint section itself and the setting of related reserved structures, the positioning, assembly, pouring and grouting of the steel-concrete joint section are facilitated, thereby ensuring the construction quality and construction efficiency of the steel-concrete joint section.

[0032] As shown in the accompanying drawings, the longitudinal shear key steel plate 5 and the transverse shear key steel plate 6 are U-shaped steel plates, and the length of the longitudinal shear key steel plate 5 is greater than the length of the transverse shear key steel plate 6. For example, in one embodiment, the U-shaped steel plate used for the longitudinal shear key steel plate 5 has a size of 6.8m×3.0m, and the U-shaped steel plate used for the transverse shear key steel plate 6 has a size of 5.0m×3.0m. The thickness of the U-shaped steel plate is 6cm, and steel holes 7 with a diameter of 100mm are evenly arranged on the U-shaped steel plate for tying stress reinforcement bars 17. The diameter of the stress reinforcement bars 17 is selected from C32 steel bars. The binding of the stress steel bars 17 in this embodiment is specifically shown in the accompanying drawings. The stress steel bars 17 in the longitudinal direction of the bridge sequentially pass through the corresponding steel holes 7 on the two transverse shear key steel plates 6 to form an arrangement of stress steel bars 17 in the longitudinal direction of the bridge. The stress steel bars 17 in the transverse direction of the bridge sequentially pass through the corresponding steel holes 7 on the two transverse shear key steel plates 5 to form an arrangement of stress steel bars 17 in the transverse direction of the bridge. The arrangement of stress steel bars 17 in the longitudinal direction of the bridge and the arrangement of stress steel bars 17 in the transverse direction of the bridge are staggered and stacked to form a three-dimensional stress steel bar 17 network, which has a better prestressed effect after the steel-concrete joint section is cast and formed, thereby ensuring the force transmission effect of the steel-concrete joint section, forming a safer and more reliable steel-concrete connection structure of the cable-stayed bridge, and improving the bearing capacity and safety of the cable tower.

[0033] As a preferred embodiment, as shown in the accompanying drawings, the anchor box 2 in this embodiment specifically includes an outer peripheral anchor box and an inner peripheral anchor box. The outer peripheral anchor box is arranged along the outer periphery of the shear key, and outer peripheral anchor box positioning holes 4 are provided on the pressure plate 3 along the outer periphery of the shear key. The inner peripheral anchor box is arranged along the inner periphery of the shear key, and inner peripheral anchor box positioning holes 4 are provided on the pressure plate 3 along the inner periphery of the shear key. The anchor rods 8 include an outer anchor rod corresponding to the outer peripheral anchor box and an inner anchor rod corresponding to the inner peripheral anchor box. The inner and outer anchor rods 8 are arranged, and the anchor rods 8 utilize large-diameter, high-strength screws. Based on the steel-concrete connection structure design of the cable-stayed bridge in this embodiment, one end of the anchor rod 8 is anchored to the steel-concrete joint section, and the other end is anchored to the anchor beam embedded in the concrete tower column. By applying pre-tension to the screw rod, close contact between the steel tower column section and the supporting surface is maintained, ensuring the force transmission effect of the steel-concrete joint section in this embodiment. In addition, corresponding to the different lengths of the longitudinal shear key steel plate 5 and the transverse shear key steel plate 6 in this embodiment, the number of anchor rods 8 arranged on the longitudinal side is greater than the number of anchor rods 8 arranged on the transverse side. As shown in the accompanying drawings, a total of 52 anchor rods 8 are arranged in the steel-concrete joint section of this embodiment to meet the tensioning force requirements of the steel-concrete joint section of the embodiment.

[0034] In this embodiment, as shown in the accompanying drawings, the built-in anchor rod bracket includes a plurality of seamless steel pipes 12, and the seamless steel pipes 12 are respectively sleeved on the anchor rod 8. On the one hand, the seamless steel pipes 12 of this embodiment are used as grouting pipes for grouting after the concrete pouring of the steel-concrete joint section, thereby ensuring the overall casting quality and strength of the steel-concrete joint section. On the other hand, they can further improve the tensioning and stress effects of the anchor rod 8, further improve the overall force and force transmission effects of the steel-concrete joint section, and make it safer and more reliable. Specifically, in order to achieve the above-mentioned functions of the seamless steel pipe 12, as a feasible embodiment, referring to the accompanying drawings, in this embodiment, a small drill is used to drill a hole at the lower position of the seamless steel pipe 12 before installation, and then a 2 cm connecting pipe 13 is welded on the hole. The connecting pipe 13 connects the plastic pipe 14 to the outside of the template and is used as a reserved grouting pipe. After the tensioning adjustment of the anchor rod 8 is completed, the anchor box 2 is grouting treated through the seamless steel pipe 12 and the reserved grouting pipe. In order to ensure the fullness of the grouting, in this embodiment, an exhaust hole 15 for grouting exhaust is provided on the top of the anchor box 2. During the grouting process of the anchor box 2, the gas in the anchor box 2 can be discharged outward from the exhaust hole 15, avoiding the existence of bubbles and floating slurry, so that the concrete can be completely filled and full, thereby ensuring the strength of the concrete.

[0035] On the other hand, in order to facilitate the positioning, alignment and installation of the anchor rod 8 of this embodiment, as shown in the accompanying drawings, in this embodiment, the upper end of the anchor rod 8 is provided with a hand winch 16 for assisting the installation of the anchor rod 8. During the actual lifting process, the steel-concrete combined section body is lifted by a tower crane and then slowly lowered until the bottom of the shear key is 50 cm away from the top of the anchor rod 8, and its posture is adjusted by rotating the chain segment of the hand winch. After the posture is adjusted, the steel-concrete combined section body is slowly lowered until the anchor screw is about 50 cm away from the pressure plate 3, and the anchor rod 8 is aligned one by one with the anchor box positioning holes 4, and the steel-concrete combined section body is continued to be lowered until the seamless steel pipe 12 is about 5 cm away from the pressure plate 3. The seamless steel pipes 12 are manually lifted one by one and passed through the anchor box 2 and fixed by welding, and then the steel-concrete combined section body is lowered into place. After being lowered into place, the 52 anchor rods 8 are pulled upward through the lifting ring welded in advance on the top of the anchor rod 8 using a hand hoist 16 and a simple hook to smoothly pass through the anchor box 2, completing the alignment and installation of the anchor rods 8.

[0036] As described above, when the steel-concrete combined section of this embodiment connects the upper steel tower column and the lower concrete tower column, the compressive stress of the steel tower column cross section is evenly transferred to the concrete supporting surface through the pressure plate 3. The root of the outer wall panel 1 of the upper tower column of this embodiment is fixed to the pressure plate 3 by welding. A preferred embodiment is that the positions of the longitudinal shear key steel plate 5 and the transverse shear key steel plate 6 on the pressure plate 3 correspond to the positions of the outer wall panel 1 of the upper tower column, so as to better transfer the compressive stress of the upper tower column.

[0037] It is easy to understand that after the main body of the steel-concrete combined section of this embodiment is assembled with the built-in anchor rod bracket and the stress reinforcement 17 is tied, concrete pouring is required to form the steel-concrete combined section of the cable tower to achieve the bearing capacity and stress transmission of the cable tower. For the concrete pouring of the steel-concrete combined section of this embodiment, a main discharge port 18 for concrete pouring is specifically opened in the middle of the pressure plate 3. Before the concrete pouring, see the attached Figure 8 As shown, formwork is installed around the steel-concrete joint, creating an outer cavity between the formwork and the shear key, and an inner cavity within the shear key for concrete pouring. During pouring, the central main feed opening 18 is used as the primary method, and, depending on actual conditions, several peripheral feed openings 19 are installed around the steel-concrete joint for auxiliary concrete pouring. This improves the pouring speed and quality of the steel-concrete joint, ensuring concrete strength.

[0038] The above description is only for the preferred embodiment of the present invention, which should not be construed as limiting the claims. The present invention is not limited to the above embodiment, and its specific structure is allowed to be varied. In short, all variations made within the scope of protection of the independent claims of the present invention are also within the scope of protection of the present invention.

Claims

1. A steel-concrete connection structure of a cable-stayed bridge with reliable force transmission, characterized by: It includes the main body of the steel-concrete combined section and the built-in anchor rod bracket; The main body of the steel-concrete combined section includes an upper tower column outer wall plate, an anchor box, a pressure plate and a shear key; the upper tower column outer wall plate and the anchor box are arranged on a first side surface of the pressure plate, and a plurality of the anchor boxes are spaced along the edges of the pressure plate, and a plurality of through anchor box positioning holes are provided on the pressure plate corresponding to the anchor boxes; the shear key is provided on a second side surface of the pressure plate, including two oppositely arranged longitudinal shear key steel plates and two oppositely arranged transverse shear key steel plates, and the longitudinal shear key steel plates and the transverse shear key steel plates are evenly arranged with steel holes for passing shear key steel bars, and the longitudinal shear key steel plates and the transverse shear key steel plates are connected in sequence to surround and constitute the inner cavity of the main body of the steel-concrete combined section; The built-in anchor rod bracket includes anchor rods and anchor beams. The anchor rods corresponding to the number of anchor boxes are installed on the anchor beams to form the built-in anchor rod bracket. The anchor rods pass through the anchor box positioning holes of the corresponding anchor boxes and are connected and fixed to the main body of the steel-concrete combined section.

2. The steel-concrete connection structure of a cable-stayed bridge with reliable force transmission according to claim 1 is characterized in that: The longitudinal shear key steel plate and the transverse shear key steel plate are U-shaped steel plates, and the length of the longitudinal shear key steel plate is greater than the length of the transverse shear key steel plate.

3. The steel-concrete connection structure of a cable-stayed bridge with reliable force transmission according to claim 1 or 2, characterized in that: The anchor box includes an outer peripheral anchor box and an inner peripheral anchor box; the outer peripheral anchor box is arranged along the outer periphery of the shear key, and outer peripheral anchor box positioning holes are arranged on the pressure plate along the outer periphery of the shear key; the inner peripheral anchor box is arranged along the inner periphery of the shear key, and inner peripheral anchor box positioning holes are arranged on the pressure plate along the inner periphery of the shear key; the anchor rod includes an outer anchor rod corresponding to the outer peripheral anchor box and an inner anchor rod corresponding to the inner peripheral anchor box.

4. The steel-concrete connection structure of a cable-stayed bridge with reliable force transmission according to claim 3 is characterized in that: The built-in anchor rod support comprises a plurality of seamless steel pipes, and the seamless steel pipes are respectively sleeved on the anchor rods.

5. The steel-concrete connection structure of a cable-stayed bridge with reliable force transmission according to claim 4 is characterized in that: The seamless steel pipe is provided with a reserved grouting pipe for grouting.

6. The steel-concrete connection structure of a cable-stayed bridge with reliable force transmission according to claim 5 is characterized in that: The reserved grouting pipe is a plastic pipe, a hole is opened on the seamless steel pipe and a connecting pipe is welded thereon, and the reserved grouting pipe is installed on the connecting pipe.

7. The steel-concrete connection structure of a cable-stayed bridge with reliable force transmission according to claim 3 is characterized in that: The top of the anchor box is provided with an exhaust hole for grouting exhaust.

8. The steel-concrete connection structure of a cable-stayed bridge with reliable force transmission according to claim 3 is characterized in that: A hand chain hoist for assisting the installation of the anchor rod is arranged at the upper end of the anchor rod.

9. The steel-concrete connection structure of a cable-stayed bridge with reliable force transmission according to claim 3 is characterized in that: The positions of the longitudinal shear key steel plate and the transverse shear key steel plate on the pressure plate correspond to the positions of the outer wall plate of the upper tower column.

10. The steel-concrete connection structure of a cable-stayed bridge with reliable force transmission according to claim 3 is characterized in that: A main discharge port for concrete pouring is provided in the middle of the pressure plate.

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